I got Hifiman leather pads for $25 (for e.g. the HE-500) to fit on the Somics:

I further padded the rim inside with tissue to further raise the pads to clear my ears and glasses completely. (the hifiman pads, stock, touch the tips of my ears. The stock Somic pads press on my ears hard, padded up with tissue they still press on my ears somewhat.)

It's a really loose fit but they're ooh-so comfortable and butch looking now, almost like mini Sony XB1000s with that huge-pad appearance. Sonically it's fine too, it won't lose bass seal because of the loose fit.

Nice... I had a set of beyer velours on them yesterday and they kinda fit. I have to grab them by the top and bottom instead of the sides, otherwise the pads will pop off. I might pick up the HiFiman velours. Using velours tames the bass quite a bit so it's more punchy than thumpy now. I did the headband mod, where I pulled the plastic out of the headband. It's so much lighter and comfier but the leather padding it flimsy now. I'll probably buy a beyer replacement pad for the headband. Also, need to find a thinner foam disc. A thin flimsier foam or maybe sock brightens up the highs. The beyer foam does a good job too but not as much sparkle. Going to play around with them a bit more... maybe removeable cable mod just for kicks. :D

No mods inside the cups. I just removed the old cable. With the HM5 pads I got comfort, tight fit, but wasn't happy with the sound. Cable change took care of that. I have been experimenting the last couple of months with different headphone wire on my HD600 and HD580. I built eight different cables with wire I was able to purchase. To save on the cost of the wire I used high end wire for the signal, and cheaper Mogami Gold HD croyoed wire for the returns (ground). Found that the signal wire was important to the sound, but the return could be of lesser quality, and the sound took on the signal wire profile. So, I found some Cardas 24 gauge litz, and coupled it with Mogami W2893 cryoed 28 gauge wire. The Mogami by itself is very neutral, used it on my S500's. But, I wanted more quality bass and more sparkle up top. From previous experience with the Cardas on the HD600/580, I got just that, more quality bass and more sparkle, as well as improved mids. I used Imperial Red type 1 paracord to sleeve each individual wire. All turned out just I was hoping. Fantastic sound, with the Somic sig, wide open soundstage, Fantastic results....just thought I'd share the pic's!

I wonder what big HM5-style pads would do for the MH463. The tighter fit would probably help a bit with the headphone weight and the broader cups would likely be more comfortable than the Turtle Beach (which are already 1000 times more comfortable than stock pads).